Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d702a96b9759450…

MALICIOUS

PDF

47.4 KB Created: 2021-06-09 07:51:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f33333bad361a02a32dd45852cf0832a SHA-1: 67c9364091f97cd035ee1176e6f155337378bf5a SHA-256: 9d702a96b97594504b95cd4bc551cd7b23166b9e328b3bd3cff53409ca46aca9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document impersonates the brand Apple to trick users into downloading a malicious file. The document contains a large number of external links, many of which are SEO-optimized PDF links, suggesting a link farm designed to host malicious content. The primary malicious URL identified is https://netcdn.tw/app/431946152/downloader-hacker-commmds-in-roblox-game-hack, which is likely used to distribute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/downloader-hacker-commmds-in-roblox-game-hack.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/downloader-hacker-commmds-in-roblox-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-gift-card-codes-live-now_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/tiktok-free-tiktok_GM835599320.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/is-tiktok-free-on-apple-store_GM835599320.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-admin-comands-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/ww-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005004.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5004 25160 bytes
SHA-256: 23f996ba767998d2b3a88195749183692b351d6bb6376c2c7c8bfd7f411e21d3
font_01_sfnt_off00008a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off0000945f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x945F 18948 bytes
SHA-256: 9958247f3e43da798d20fad0eef9f0ccbd6092e450bc9790b84427ea33987310

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